Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Basalt (Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)) — igneous

Basalt

Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

igneous
Shale (possibly) (Shale (fine-grained clastic sedimentary rock)) — sedimentary

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

sedimentary
Basalt (Basalt (comprising plagioclase, pyroxene, and olivine)) — igneous

Basalt

Basalt (comprising plagioclase, pyroxene, and olivine)

igneous
Quartz on Schist (Silicon Dioxide (SiO2) on Foliated Metamorphic Rock) — metamorphic

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

metamorphic
Quartz (Variety: Citrine or Tumbled Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz (Variety: Citrine or Tumbled Chalcedony)

Silicon Dioxide (SiO2)

mineral
Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

mineral
Basalt (Vesicular and Scoria) (Basalt (extrusive volcanic rock)) — igneous

Basalt (Vesicular and Scoria)

Basalt (extrusive volcanic rock)

igneous
Biotite Mica (Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)) — mineral

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

mineral
Moss Agate Geode Sphere (Silicon Dioxide (SiO2) - Chalcedony with Chlorite or Manganese inclusions) — mineral

Moss Agate Geode Sphere

Silicon Dioxide (SiO2) - Chalcedony with Chlorite or Manganese inclusions

mineral
Sandstone with Magnetite and Iron Staining (Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)) — sedimentary

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

sedimentary
Granite (Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

igneous
Pumice (Felsic Volcanic Glass / Vesicular Rhyolite) — Igneous

Pumice

Felsic Volcanic Glass / Vesicular Rhyolite

Igneous
Snowflake Obsidian (Obsidian (volcanic glass) with Cristobalite inclusions) — igneous

Snowflake Obsidian

Obsidian (volcanic glass) with Cristobalite inclusions

igneous
Red Slag Glass (Cullet) (Amorphous Silicon Dioxide (SiO2) with metallic dopants) — Antropogenic (Man-made material)

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Antropogenic (Man-made material)
Blue Apatite (Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

mineral
Chert (Yellow Jasper variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

sedimentary
Black Tourmaline (Schorl) (Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH) — mineral

Black Tourmaline (Schorl)

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH

mineral
Calcite with iron staining (Calcium Carbonate (CaCO3)) — mineral

Calcite with iron staining

Calcium Carbonate (CaCO3)

mineral
Sapphire (Corundum) (Corundum (Al2O3), variety Sapphire) — Mineral

Sapphire (Corundum)

Corundum (Al2O3), variety Sapphire

Mineral
Obsidian (Obsidian (Volcanic glass), 70-75% SiO2) — igneous

Obsidian

Obsidian (Volcanic glass), 70-75% SiO2

igneous
Jadeite Jade (Jadeite (NaAlSi2O6)) — metamorphic

Jadeite Jade

Jadeite (NaAlSi2O6)

metamorphic
Scoria (Lava Rock) (Scoria (highly vesicular extrusive igneous rock)) — igneous

Scoria (Lava Rock)

Scoria (highly vesicular extrusive igneous rock)

igneous
Pumice (Vesicular volcanic glass) — igneous

Pumice

Vesicular volcanic glass

igneous
Quartz in Limonite-rich Matrix (Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O) — Mineral in Sedimentary/Secondary host

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Mineral in Sedimentary/Secondary host
Gastropod Fossil (Snail Internal Cast) (Class Gastropoda (Steinkern)) — sedimentary

Gastropod Fossil (Snail Internal Cast)

Class Gastropoda (Steinkern)

sedimentary
Sandstone Moqui Marble (Concretion) (Iron oxide concretion (Hematite/Goethite and Quartz)) — sedimentary

Sandstone Moqui Marble (Concretion)

Iron oxide concretion (Hematite/Goethite and Quartz)

sedimentary
Gneiss (specifically a Granitic Gneiss) (Gneiss (Composition: Quartz, Feldspar, Mica)) — metamorphic

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)

metamorphic
Ferruginous Sandstone (Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)) — sedimentary

Ferruginous Sandstone

Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)

sedimentary
Ferruginous Sandstone (Arenite with Iron-oxide cement) — sedimentary

Ferruginous Sandstone

Arenite with Iron-oxide cement

sedimentary
Mica (Muscovite) (Muscovite, KAl2(AlSi3O10)(OH)2) — Mineral

Mica (Muscovite)

Muscovite, KAl2(AlSi3O10)(OH)2

Mineral
Banded Iron Formation (Jaspilite) (Banded Iron Formation (BIF); predominantly Hematite (Fe2O3) and Magnetite (Fe3O4) with Chert/Jasper (SiO2)) — sedimentary

Banded Iron Formation (Jaspilite)

Banded Iron Formation (BIF); predominantly Hematite (Fe2O3) and Magnetite (Fe3O4) with Chert/Jasper (SiO2)

sedimentary
Aventurine (Quartz (Aventurine variety)) — Mineral

Aventurine

Quartz (Aventurine variety)

Mineral
Glauconitic Sandstone (Greensand) (Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

sedimentary
Sandstone (Quartzose) (Arenite (SiO2 based)) — sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

sedimentary
Ferruginous Quartzite (also known as Ironstone or Gossan) (Ferruginous Quartzite with Goethite/Hematite staining) — metamorphic

Ferruginous Quartzite (also known as Ironstone or Gossan)

Ferruginous Quartzite with Goethite/Hematite staining

metamorphic
Scoria (Vesicular Basalt / Scoriaceous Basalt) — igneous

Scoria

Vesicular Basalt / Scoriaceous Basalt

igneous
Scoria (Lava Rock) (Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)) — igneous

Scoria (Lava Rock)

Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)

igneous
Granite (Granite (a felsic intrusive igneous rock)) — Igneous Rock

Granite

Granite (a felsic intrusive igneous rock)

Igneous Rock
Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

sedimentary
Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

sedimentary
Mica Group Minerals (There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).) — Mineral

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Mineral
Biotite Mica in Quartz (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)) — mineral

Biotite Mica in Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)

mineral